| Saint-Mary-le-Plain | |
| Commune Status: | Commune |
| Arrondissement: | Saint-Flour |
| Canton: | Saint-Flour-1 |
| Insee: | 15203 |
| Postal Code: | 15500 |
| Mayor: | Jean-Marc Mizoule[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 45.1875°N 3.1625°W |
| Elevation M: | 867 |
| Elevation Min M: | 640 |
| Elevation Max M: | 1021 |
| Area Km2: | 21.8 |
Saint-Mary-le-Plain (in French pronounced as /sɛ̃ maʁi lə plɛ̃/; Occitan (post 1500);: Sant Mari lo Plan) is a commune in the Cantal department in south-central France.